@misc{indiciae1db92aad8bb3,
  title = {Sampling design for spatially distributed hydrogeologic and environmental processes},
  author = {G. Christakos and Ricardo A. Olea},
  year = {1992},
  doi = {10.1016/0309-1708(92)90008-p},
  url = {https://pubs.usgs.gov/publication/70016924},
  note = {Source identifier: 70016924}
}